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496, Mint Superb NH GEM 5¢ Coil Pair -- Stuart Katz
$95.00
1818, Perforation Shift Error Plate Block of Six B (18¢) Eagle - Stuart Katz
$56.40
1818, Perforation Shift PL# Capture Error Plate Block B (18¢) Eagle Stuart Katz
$70.50
617, VF Mint NH Top PL# Sheet of 50 1¢ Stamps Brookman $400.00 - Stuart Katz
$275.00
BK96, VF Scarce 25¢ Complete Booklet - Stuart Katz
$39.95
1467a, Misperfed Error Sheet Showing Full Gutter Between Stamps - Stuart Katz
$1,410.00
1998, Very RARE Modern Misperforated ERROR Sheet of 20 32¢ Stamps - Stuart Katz
$465.30
528, Mint VF LH 2¢ Full Plate Block of Six Stamps Cat $100.00 - Stuart Katz
$59.95
3554-5c, RARE Die Cutting Omitted ERROR Pair 34¢ Olympics - Stuart Katz
$188.00
905, Two Way Misperfed ERROR Block of 12 Printed on Double Paper - Stuart Katz
$164.50
954, Misperforated ERROR Sheet of 50 California Gold 3¢ Stamps - Stuart Katz
$235.00
2367, Nice Large Color Shift ERROR Sheet of 100 22¢ Stamps - Stuart Katz
$465.30
1509, HUGE Misperforated ERROR Sheet of 100 10¢ US Flag Stamps - Stuart Katz
$653.30
1764-7a Spectacular Misperforated ERROR Sheet of 40 15¢ Tree Stamps Stuart Katz
$935.30
1484, Large Color Shift ERROR Plate Block of 12 8¢ Gershwin Stamps - Stuart Katz
$117.50
578, 1¢ Mint NH VF/XF RARE Block of Four Cat $600.00++ - Stuart Katz
$350.00
TG67B, Four Pounds Tobacco Tax Paid Stamp - Hard to Find! -- Stuart Katz
$175.00
1096, 8¢ Very Scarce Reverse Printing ERROR With Normal Mint NH - Stuart Katz
$70.50
2015, 20¢ Very Scarce Reverse Printing ERROR With Normal Mint NH - Stuart Katz
$47.00
All Over Ad Tuttle & Co Book Sellers Rutland, VT 6/24/1890 - Stuart Katz
$69.99
2635a, MNH 29¢ Alaska Black "USA 29" Omitted MAJOR ERROR - Stuart Katz
$352.50
All Over Ad Cover Benziger Brothers Magazine With Frame NY 1905 - Stuart Katz
$59.99
Sailing Boats St. Joseph, MO 6/15/1912 to Hanover, PA Stunning Cvr - Stuart Katz
$124.99
Chas. L. Lockwoods Humorous Advertising Cover - Stuart Katz
$14.00
C18, VF/XF NH 50¢ Zepp Airmail Block of Four Stamps Cat $300.00 - Stuart Katz
$175.00
665, VF NH 7¢ Kansas Plate Block of Four Stamps Cat $700.00 - Stuart Katz
$425.00
531, Mint 1¢ Superb NH Plate Block of Six Stamps Cat $200.00 - Stuart Katz
$165.00
377, Mint 4¢ VF NH Block of Six Stamps VERY FRESH Cat $390.00 - Stuart Katz
$150.00
536, Mint 1¢ F/VF NH Plate Block of Six Stamps Cat $400.00 - Stuart Katz
$225.00
RW78A, White-Fronted Geese Federal DUCK Stamp Self-Adhesive Pane - Stuart Katz
$37.95
153, Used 24¢ Nice Stamp With a Red Cancel Cat $235.00 - Stuart Katz
$40.00
527, VF-XF NH 2¢ Bottom Plate Block of Six P.O. Fresh! - Stuart Katz
$300.00
3205 Imperforate Sylvester/Tweety Bird Pad of 100 Panes Cat $1250.00 Stuart Katz
$350.00
1726, Mint VF NH Untagged ERROR 13¢ Plate Block Cat $400.00 - Stuart Katz
$235.00
540, VF NH 2¢ Plate Block of Four+ With PL# S 30 Cat $230.00 - Stuart Katz
$165.00
805b, Mint NH Imperforate Between ERROR Cat $125.00 - Stuart Katz
$47.00
R86a, Used XF $3 Manifest Revenue Stamp Cat $200.00+ - Stuart Katz
$160.00
1690a, VF Mint NH 13¢ WIth Blue Color Omitted ERROR With Normal - Stuart Katz
$108.10
1935, MNH 18¢ Misperforated ERROR Plate Block of Four Stamps - Stuart Katz
$117.50
2110, MNH 22¢ Misperforated ERROR Plate Block of Six Stamps - Stuart Katz
$164.50
2203, MNH 22¢ Misperforated ERROR Plate Block of Four Stamps - Stuart Katz
$89.30
1936, MNH 20¢ Brown Color Shift ERROR Plate Block of Four Stamps - Stuart Katz
$47.00
1735, Major Fold Over ERROR Plate Block of Six 15¢ Stamps MNH - Stuart Katz
$258.50
1716, Red Color Missing From Top Right Stamp MAJOR ERROR Mint NH - Stuart Katz
$235.00
807, Six Misperforation ERROR Plate Blocks 3¢ Prexie Stamps - Stuart Katz
$188.00
1731, Misperforated ERROR Plate Block With PL# Captured on Stamp - Stuart Katz
$47.00
1477, Large Misperforation Shift ERROR Block of Six Mint NH -- Stuart Katz
$84.60
Phillippines 243, Mint Scarce Misperforation ERROR Block of Six - Stuart Katz
$117.50
RW73, $15.00 Ross Geese Duck Stamp VF OG NH - Stuart Katz
$26.95
1732, 13¢ Misperforation ERROR Plate Block Captain Cook MNH - Stuart Katz
$89.30
1756, Dramatic Fold Over ERROR Plate Block 15¢ George Cohan MNH - Stuart Katz
$164.50
1823, 15¢ Misperforation ERROR Plate Block With PL# Captured MNH - Stuart Katz
$84.60
RW76A, $15 Long-Tailed DUCK Stamp Self-Adhesive Pane - Stuart Katz
$32.95
2011, Amazing Paperfold ERROR Plate Block of 9 Stamps - Stuart Katz
$235.00
1879a, Large Misperforation Shift ERROR Plate Block of Flowers - Stuart Katz
$117.50
RW74, $15.00 Ring Necked Duck Stamp VF OG NH - Stuart Katz
$26.95
1542a, Superb NH Dull Black Color Omitted ERROR With Normal - Stuart Katz
$329.00
631, Mint Superb LH - NO GUM BREAKERS Plate Block of Four Stamps - Stuart Katz
$300.00
411, Mint 2¢ VF NH Coil Strip of Three in Carmine Well Centered - Stuart Katz
$60.00
2283, MNH 25¢ Imperforate Between Booklet Pane ERROR PW - Stuart Katz
$470.00
2513P, MNH XF Imperforate Pair 25¢ Eisenhower Proof Cat $875.00 - Stuart Katz
$658.00
2902a, XF Mint NH Nonprofit Org Imperforate Coil Pair ERROR - Stuart Katz
$376.00
1467a, MNH 8¢ Wildlife Large Color Shift Freak Error Block of 4 - Stuart Katz
$93.06
1597, MNH 15¢ Flag Block of Four With Solvent Smear ERROR - Stuart Katz
$47.00
1157, 4¢ Mexico Misperforated ERROR Block of Six Stamps Mint NH - Stuart Katz
$47.00
2980a, Mint NH Black 32¢ Color Omitted ERROR With Normal - Stuart Katz
$235.00
1597b, Mint NH 15¢ Flag Stamp Gray Color Omitted ERROR With Normal - Stuart Katz
$258.50
425, Mint 2¢ LH/NH Block With "Pink Back" Analine - Scarce! -- Stuart Katz
$75.00
1560a, Mint NH 10¢ Bicentennial Back Inscription Omitted ERROR - Stuart Katz
$108.10
2551a, Mint NH 29¢ Veterans Imperforate Between Pair ERROR - Stuart Katz
$282.00
1622b, Mint NH Imperforate Block of Four From Sheet ERROR - Stuart Katz
$423.00
1890b, MNH 18¢ Flag Vertical Pair Imperforate Horizontal ERROR PFC - Stuart Katz
$470.00
2092a, Mint NH XF 20¢ Ducks Imperforate Between ERROR - Stuart Katz
$258.50
2764c, Mint NH 29¢ Flowers Imperforate Booklet Pane of 5 ERROR - Stuart Katz
$799.00
1698b, MNH 13¢ Winter Olympics Imperforate Block of Four ERROR - Stuart Katz
$282.00
2189a, 52¢ Humphrey Shiny Gum Sheet of 100 Stamps CV $395.00 - Stuart Katz
$250.00
2180, 21¢ Chester Carlson Complete Pane of 100 Stamps CV $67.50 - Stuart Katz
$39.95
1731, MNH 13¢ RARE Misperforated ERROR Pane of 50 Stamps - Stuart Katz
$376.00
540, Mint NH F/VF Top Plate Block of Four Stamps Cat $175.00 - Stuart Katz
$75.00
1825a, Mint NH Imperforate ERROR Pair - Veterans Admin Cat $375.00 - Stuart Katz
$277.30
RW78, 2011 White-Fronted Geese Federal $15 Duck Stamp Mint NH - Stuart Katz
$44.95
RW12, Mint VF-XF NH Top Plate Block of Six Duck Stamps Cat $600.00 - Stuart Katz
$475.00
Scott RW74A Ring-Necked Duck Federal Duck Stamp Self Adhesive Pane - Stuart Katz
$29.95
1420a, Mint VF NH 6¢ Pilgrim Orange & Yellow Omitted ERROR * Stuart Katz
$399.50
Peanuts - Snoopy Full Sheet of Twenty 34 Cent Stamps Scott 3507 - Stuart Katz
$17.95
TDB36, 1988 Jack London Test Booklet Complete Unexploded Cat $410.00 Stuart Katz
$250.00
1996 Atlanta Summer Olympics Games Sheet of Twenty 32 Cent Stamps Scott 3068
$11.95
Endangered Species Collectible Sheet Fifteen 32 Cent Stamps Scott 3105 By USPS
$8.50
TDB82, Green ATM Test Pane Of Eighteen Stamps Statue Of Liberty - Stuart Katz
$12.95
Sylvester and Tweety Full Pane of Ten 32 Cent Stamps By USPS Scott 3204
$5.95
1920's Postage Production Test Block of 24 Stamps - Stuart Katz
$475.00
2015c, All Colors Omitted ERROR - Mint VF NH With Normal - Stuart Katz
$117.50
390, Mint VF NH Line Pair, Coil Pair and Single Stamp Cat $104.50 - Stuart Katz
$75.00
3477, Misperfed Error Strip of Six With PL#4444 - Mint NH - Stuart Katz
$37.60
530, RARE MISPERFORATION ERROR - TOP PLATE BLOCK OF SIX - Stuart Katz
$211.65
540a, Mint VF-XF NH Imperforate Between Block of Eight Cat $550.00 - Stuart Katz
$450.00
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